Invoking Zoho Projects services via API failed, error 6501 returned

Hi Zoho Projects,

I'm programming and testing Zoho Projects API. I have got apikey, also got the ticket following the instructions. However, when I try to invoke getportals service, I receive 6501 error ( Input Parameter Doesnt Match the Pattern Specified). Can anyone shred some light on this?

Here is the html I set up to invoke getportals service (apikey has been masked, not the real one):

<!DOCTYPE html>

<html>

<head>

<title>Zoho getportals</title>

</head>

<body>

</form>

</body>

</html>

Thanks,

- Terrence

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